High-flexibility fuse trimming circuit and use method thereof

Abstract

The invention provides a high-flexibility fuse trimming circuit. The fuse trimming circuit comprises a trimming control circuit, a fuse control circuit, a current melting fuse, an output driver, and a SRAM static storage cell. The fuse control circuit is formed by a fusing current control tube M1 and a constant current source I1. The constant current source I1 is connected with a chip power supply and the current melting fuse. The other output end of the trimming control circuit is connected with the SRAM static storage cell. The output driver is formed by a multiplexer, and an output end of the output driver is connected with the output end of the SRAM static storage cell and the current melting fuse. The fuse trimming circuit realizes to replace fuse operation by SRAM output in a simulation trimming stage through arrangement of the SRAM static storage cell, and repeated programming is realized, so as to effectively improve trimming circuit flexibility and trimming precision.

Description

【Technical field】 [0001] The invention relates to the technical field of semiconductor integrated circuits, in particular to a fuse trimming circuit based on current fusing. 【Background technique】 [0002] With the development of high-speed and low-power signal processing technology, the precision requirements for semiconductor integrated circuits are becoming more and more stringent. However, there are various non-ideal factors in the manufacturing process of semiconductor chips, which makes many performance parameters of semiconductor chips, especially the precision. The parameters are difficult to meet the requirements of high-speed and high-precision signal processing. Therefore, it has become an effective and economical means of performance optimization to perform trimming on the tape-out chip to improve its precision and make its parameter distribution more concentrated. [0003] The trimming unit can be a multi-time programmable device such as EEPROM, or a one-time p...

AI Technical Summary

Problems solved by technology

However, when the invention fuses the fuse, the fusing current needs to pass through a PMOS switch tube, an NMOS switch tube and a resistor, and the current required for fuse blowing generally exceeds 100mA, so the size requirements of the above two MOS tubes are relatively large. Occupy more area

In addition, the fuse of this invention can only be burned once, and there is no chance of repentance, so there is a defect of insufficient flexibility

[0006] It can be seen that the biggest defect of the existing technology is that the current fuse trimming circuit can only be programmed once, and there are defects of low fault tolerance and poor flexibility.

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